Technical Service Bulletin Bleed CIS System if Fuel Lines Are Opened

Subject: Bleed CIS System if Fuel Lines are Opened Models: 911/924 ALL

Bulletin Number: 77 – 02

Bleeding of system is necessary if, during CIS repairs, any fuel lines are loosened or removed.

CIS bleeding operation

Remove all injectors at engine

Place injectors in Tester US4480.
Remove rubber elbow from top if air flow sensor

Remove fuel pump relay at fuse/relay panel and install jumper switch adapter US4480/3
Switch fuel pump on with switch on US4480/03
Move airflow sensor plate up and down over its full travel for approximately 2 minutes
Switch off fuel pump
Reinstall rubber elbow over sensor plate
Reinstall fuel pump relay on fuse/relay panel

Re-insert injectors in engine (use new rubber seals, Part No. 063.133.557)
Pour accumulated fuel in tubes of US4480 back into fuel tank.
Start engine and check for proper operation.